Electrical Failure problems of the 2007 Lexus RX350

All the dashboard instrument warning lights come on and stay on until the engine/ignition key is turned-off. No apparent mechanical or electrical failure as indicated by all the dash warning lights. The sudden appearance of the entire dash warning light system energizing is unnerving to say the least. This has been an ongoing malfunction that the dealer cannot locate or reproduce. The most recent occurrence was on April 7th and again on April 11th, both while the car was in motion and stayed on until the engine was shutdown. The lights did not come on after a restart. The repeating occurrence renders the warning system totally ineffective, in the event of a real mechanical or electrical failure.